JPS6359237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a door of a microwave oven or the like, which is a high-frequency heating device.

Conventional structure and its problems Conventionally, microwave ovens, which are high-frequency heating devices, have a magnetron installed at the periphery of the door at the opening of the heating chamber in order to prevent the leakage of high-frequency waves from the opening of the heating chamber. In addition to providing a chiyoke groove with a depth of 1/4 of the wavelength, ferrite, which is a radio wave absorber, is provided on the approximately U-shaped sash facing the periphery of the door, and a chiyoke groove provided on the periphery of the door is provided. A periodic structure having slits at regular intervals was provided in the groove (see Japanese Patent Application No. 47063/1983).

In FIG. 4, which shows a cross-sectional view of a main part of a door portion of a conventional high-frequency heating device, 20 is a heating chamber provided in the main body of the high-frequency heating device, and a door 21 is provided at the opening so as to be openable and closable. A main body front plate 23 is provided behind the door 21, and above the door 21 is an operation panel 22 having a timer knob for controlling heating time, etc. A sash 24 protruding from the front plate 23 at the periphery of the opening of the heating chamber 20 is attached to the door 21 side of the operation panel 22. On the other hand, an inner plate 25 and an outer plate 26 of the door 21 form a chain groove 27 on the outer periphery of the door 21, and a periodic structure 28 having periodic slits is provided in the chain groove 27. A chiyoke cover 29 made of a polymeric material with low dielectric loss is provided at the opening of the chiyoke groove 27. Further, a transparent sheet 30 is attached to the inside of the door 21, and the end face is held down by an inner plate 25 to prevent it from being turned up, and the inner plate 25 is fixed to the outer plate 26 with screws 31. On the other hand, door 21
A transparent plate 32 is provided on the outside of the outer panel 26 of the door, and a handle 33 is tightened with screws 34 from within the yoke groove 27 of the outer panel 26 of the door.

According to the above configuration, the door 21 and the periodic structure 2
It was difficult to integrally form the handle 33 with the yoke cover 29 and the handle 33.

Therefore, there was a limit to the ability to significantly reduce costs by reducing the number of parts.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a high-frequency heating device that eliminates the above-mentioned drawbacks, has less radio wave leakage, has a small number of parts, and is highly productive.

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention includes a heating chamber that accommodates an object to be heated, a door that is openable and closable at the opening of the heating chamber, and a door that is in surface contact with the door. A sash protrudingly provided on the front plate of the heating chamber at the periphery of the opening of the heating chamber, a handle provided on the door, and an inner door plate and an outer door plate that are in surface contact with the front plate, provided on the periphery of the door. a door arch yoke groove, a yoke opening cover provided in the yoke groove opening, and a transparent plate provided outside the door outer panel, the yoke opening being provided on a side surface of the door facing the sash, and the yoke opening being The cover, handle, and transparent plate are integrally constructed, and even if the number of parts of the door is reduced, it has no effect on radio wave leakage and contributes to a significant cost reduction.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 2, reference numeral 1 denotes a main body of the high-frequency heating device, and a door 3 is provided at the opening of a heating chamber 2 provided in the main body 1 so as to be openable and closable. 4 is an operation panel provided on the front of the main body 1, and this operation panel 4 has a timer knob 5 for controlling the heating time.
A cooking start button 6 and a cooking indicator lamp 7 are provided. The door 3 has a handle 30 for opening and closing.
is fixed.

In FIG. 3, reference numeral 8 denotes a high frequency generator that supplies high frequency waves into the heating chamber 2. As shown in FIG. Reference numeral 9 denotes a radio stirring blade for stirring the high frequency waves supplied into the heating chamber 2, which is used to improve the distribution characteristics of the high frequency waves within the heating chamber 2. 10 is a sash provided opposite the peripheral edge of the door 3.

In FIG. 1, the configuration of the door 3, operation panel 4, and sash 10 is shown. A metal door outer panel 11 constituting the door 3 is provided with numerous small punching holes 13 in a see-through window section 12, and one end is bent into a substantially L shape toward the heating chamber, and is further bent into an L shape. Groove 18
It is bent inward. The L-shaped continuous portion of the door outer panel 11 forms a periodic structure 14 such as a slit. This slit 14 can be made when forming the door skin 11. 15 is the inner panel of the door,
This door inner plate 15 is attached to the door outer plate 11 with screws 16. On the outside of the door outer panel 11, there is a transparent cover 17 which is integrally formed with a handle 17a, a front opening cover part 17b, and a see-through window cover part 17c which is a transparent plate, and protrudes into the front opening cover part 17b. A portion 17d is provided and fixed by being hooked to the tip of the L-shaped slit 14. The inner plate 15 and outer plate 11 of the door constitute a chiyoke groove 18. Reference numeral 19 denotes an opening of a chain yoke groove provided between the end of the door inner plate 15 and the slit 14 of the door outer plate 11. The heating chamber side of the punching hole 13 is covered with a transparent sheet 50, and its end face is fastened with a door inner plate 15 with a holding screw 16.

The transparent cover 17 is made of a polymer material (plastic) with low dielectric loss that absorbs or transmits radio waves. 51 is the door inner plate 15 with the door closed.
A metal sash 10 is inserted into a rib or the like of the operation panel 4 so as to protrude from the front plate of the opening periphery of the heating chamber 2 in surface contact with the front plate of the opening periphery.

The operation of the above configuration will be explained below.
First, the object to be heated is placed in the heating chamber 2, the cooking time is set using the timer knob 5, and when the cooking start button 6 is pressed, the high frequency generator 8 is activated to supply high frequency waves into the heating chamber 2, and the Objects can be heated dielectrically.

The high frequency waves supplied into the heating chamber 2 are prevented from leaking out of the heating chamber 2 by the surface contact between the opening peripheral front plate 51 of the heating chamber 2 and the door inner plate 15; The high frequency waves leaking from the gap between the plate 51 and the door inner plate 15 enter the chiyoke groove 18 provided at the peripheral edge of the door 3. The high frequency waves that have entered the cheese yoke groove 18 are restricted from traveling in the X and Y directions by the slits 14 provided in the door outer panel 11, and are prevented from traveling in the Z direction.
It can be regulated by the opening 19 of. In addition, the high frequency waves leaking from the door inner plate 15 and the front plate 51 around the opening are changed in the right angle direction at the sash 10, and most of them are reflected and bounced toward the heating chamber 2. and the inner panel 15 of the door and the front panel 51 around the opening.
It is attenuated between

As described above, according to the high-frequency heating device of this embodiment, the front plate 51 at the periphery of the opening of the heating chamber 2 is heated during cooking.
Even if high-frequency waves leak from between the door inner plate 15 that is in surface contact with the door inner plate 15, the sash 10 is provided at a position facing the periphery of the door 3. Main body 1
Since high frequency energy leaking outside can be restricted, the high frequency heating device does not cause radio wave interference.

Furthermore, the slits 14 provided in the door outer panel 11 that constitute the cheese yoke groove 18 can be formed when the door outer panel 11 is molded, and the structure of the door 3 can be simplified, which improves assembly work efficiency. Good and low cost.

Furthermore, by providing the opening 19 forming the chiyoke groove 18 between the door outer panel 11 and the door inner panel 15 without facing the front panel 51 at the periphery of the opening,
It becomes possible to shorten the dimension L of the door inner plate 15 that makes surface contact with the front plate 51 at the periphery of the opening, and the main body 1 can be made smaller.

In addition, the front part of the door 3 (see-through window part 17c), the door opening cover part 17b on the periphery of the door where the opening part 19 is located, and the handle part 17a are integrally formed to have a low dielectric loss that absorbs or transmits radio waves. By covering with the molecular material, not only the number of parts can be reduced, but also the handle 17a, the yoke opening 17b, and the viewing window 17c can be easily cleaned, thereby providing an easy-to-use high-frequency heating device.

Effects of the Invention As described above, according to the high frequency heating device of the present invention, the following effects can be obtained.

(1) The high frequency waves leaking from between the front plate around the opening of the heating chamber and the inner plate of the door are attenuated by the action of the slit provided in the chuck yoke groove at the periphery of the door and the sash facing the chuck yoke opening. can be prevented from leaking out of the main body.

(2) The opening of the chiyoke groove provided at the periphery of the door should not be facing the front plate at the periphery of the opening of the heating chamber, but should be aligned between the door outer plate and the door inner plate so as to face the sash protruding from the opening periphery plate. By providing the space between the door and the door, the dimensions of the door inner plate that makes surface contact with the front plate at the periphery of the opening can be reduced, and the size of the main body can be reduced.

(3) Conventionally, the periodic structure was created separately and welded to the door outer panel, but in the present invention, the slits, which are periodic structures provided in the door outer panel, are formed when forming the door outer panel. Moreover, since the structure of the door can be simplified, assembly workability is good and the cost can be provided at low cost.

(4) The transparent body of the door, the front cover, and the handle are integrally formed, reducing the number of parts from three to one.
By reducing the number of parts,
It is possible to reduce not only costs but also assembly man-hours.

(5) Since the transparent body of the door, the yoke opening cover, and the handle are integrally formed, it is not only easy to clean each part, but each part is integrated and there are no gaps between each part, making it easier to clean than before. It becomes unhygienic because dirt accumulates in the gaps like this.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of the door of a high-frequency heating device according to an embodiment of the present invention, FIG. 2 is a perspective view of the same high-frequency heating device, FIG. 3 is a side sectional view of FIG. 2, and FIG. 1 is a sectional view of a main part of a door in a conventional high-frequency heating device. 2...Heating chamber, 3...Door, 10...Sash, 12...See-through window (transparent plate), 17a...Handle, 17b...Chiyoke opening cover, 18...
...Chiyoke Groove.

Claims (1)

[Scope of Claims] 1. A heating chamber that accommodates an object to be heated, a door provided at the opening of the heating chamber so as to be openable and closable, and a front plate of the heating chamber at the periphery of the opening of the heating chamber that makes surface contact with the door. A door arch yoke groove provided at the peripheral edge of the door, a handle provided on the door, a door inner plate and an outer door plate that are in surface contact with the front plate, and a door arch yoke groove provided at the peripheral edge of the door, and a handle provided on the door. A door opening cover provided therein, and a transparent plate provided outside the outer panel of the door, wherein the door opening is provided on a side of the door facing the sash, and the door opening cover, the handle, and the transparent plate are integrated. A high-frequency heating device configured to be installed. 2. The high-frequency heating device according to claim 1, wherein the yoke opening cover, the handle, and the transparent plate are integrally formed of a polymeric material with low dielectric loss.